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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd9fc3e6756309faa3d153e26259aa4c448c2128dedf8462ea04b2152d550e2' 
  AND token = '6yIYeRRQ/+2jq1e/5Ku7I2ojvIg3fMi85eopjiuMzx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}