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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdef88588a352a0a217c6a8242d2d65d6f28af9d080f181d7b71b3a3cdef8e2' 
  AND token = '6r3rE8O9FaWDOFiEV18fVTfKOZ52Sssg+a7mQlSc5CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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