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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c18ef30f2d8fe7237dbe58373e9ceb4dca0dab8816f7a6a0112c88d0d1c55a8f' 
  AND token = '7ijQkdZRRZ3lmZrNSzktmkcRe8X1DxO9A1nh52ExV9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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