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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb10964baea344c00b1f85797ecc7886010ccb8d3a7f56d2c28140083f544810' 
  AND token = 'QAX8V5n7EpLvrFNt0R+roQoDm4EwRosAAGlTZPd+Wyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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