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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6064d3f4bced545266542cbab174f46e2d6582f53f396f4994e9e19b1a428df2' 
  AND token = 'FXgzKT3qpHtAcFDomDOsi5dNlk/eVAtsOzH9xR44e6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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