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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a823b42411ccb04d0f03923a724996f83898728eb422575ab1723e1eeb39506c' 
  AND token = 'Kr0R/Ulsn+fq++u7gpKltcdjsYlOOOW9bKLBY6N2S50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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