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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f367c0d827d849b3766953bfa3c23e9c0be54b673c96e0a560266a0df926df' 
  AND token = 'EJ/mbfVweOt+6ikch+SfNma1Q6zcvuGYSHBTslq6Ca0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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