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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccad4f45fad7b26d6f2fc9726914782b4de792dae06536d8e09bd3a04b3dc86' 
  AND token = 'y5MCpAI+yM/N43EYJyt8cwEkypvk+69CFgX+347USlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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