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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc24a8c72a6d843982dde996d591313ebb9899d5d21a0895ef7b7631d9502a74' 
  AND token = 'zZExfEJWKGxofTsuCCfL5tDfKLx8gTKh3ShB3ktFWkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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