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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c768b3a383533b724a80fad22cacf55f5fa3566c56ec52b6a45c4f56ec905c1' 
  AND token = 'S9Zti955MKxwyo14l1Mr8fDSO0PKFgwKIz1NzgRwsS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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