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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1267518b7a9dd618d2a848bea52ab798c03c5fbbcfa6bd39d5eb9f9b4e00fdd3' 
  AND token = '0q7iy+X+nI8TiGKEEHPJrO83EIx7VLgvtxD6rGl5RK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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