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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c6fb377d817f0a61e4e58463f9c0d2d1efbb9d2c062568a677340d6809c716' 
  AND token = 'Fbh7BcJGPEbMOsLBzWMm7mXa4LUwAGtACiySNQ5msdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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