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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1786cb3dc7a1fb7333e82937f7ffd43f49829b57507c782349208dc1cb10a0' 
  AND token = 'F/MwSQGWaiYHB0ivRsEO7RhXaiwQYKEoIfhaTPJgI/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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