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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b3f9b6f3743e811e0760bd1967128cd00f6480d763a1aa19432df6e2354289b' 
  AND token = '37dELIXlq7/N2pXyic910IUjPYAJ/W8AkeynQl1RMxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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