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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9beb84d1d228d2d25d65bfbf0fb1d9f0f6f3399a9e99153bce73b2958a3e3d' 
  AND token = 'P7qC6bqDmfPL4ZV2cEq1tTt9fvFftMkkglMXnJn2r9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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