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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4effab8c3bb0473b7cb973a5887a3398a7fb7d9f8491f0dc53a1bf5f2c485cf9' 
  AND token = '/uSDIHgN5G4PkMo0ZajMuEPcz78yKt2xdMFX1tQw7Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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