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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0074f6266c2b2b0d8d929445aade55c71a3ee6f2e6e6c212b73e18813856c56' 
  AND token = 'eLWXIbJeW1cKLP88Q32mU/rPpNOvfhWTiQLDuamGagk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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