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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6118bbfd2a647580a76f4e546004046be05f1642c9d369db240afcb535d5bdf2' 
  AND token = 'GQ/ZPGeqnp/j1dZ0dLwS/BuurpIDwaep0nulaymb520=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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