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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f189558bed677fcd5100d700637988731d937dfbda2cabcb7bc07d40841baa70' 
  AND token = 'my4V6UcgAQSGFpgDyizHprH5EZW+EPP4586Y+I014V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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