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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1eeb2eecc050a48a156d73ee35c33691d0b236d8e5caf6f45b10bb7ab24ef5a' 
  AND token = 'liJQRCuAFk9WqWSiwJUhFmh09q5kSg04uJ4TAM0QCMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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