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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd3932cb64d4ec24e6063810e571d155d963e9194711e7006b7ca8776d350c0' 
  AND token = 'Gzw/hX7l7S0DEOW0MWYryYCpqq43F4W8OewlYXK2wRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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