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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90256df5ce66441ef7abf5a8feb0c622d6324bf2f4c7bcf74b437c2b3d0b51d3' 
  AND token = 'VO87nGxne0wDhczZgXdIO8oipfZdutz/fVRNw0RmBzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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