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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a3bf668b89f2a899a4bca17ce78f16206f5fa8f61b5ec0b5a55f11175efe5da' 
  AND token = 'soMpsrjlahGTAeIDYV62qj5em3clo35n+HGK1q5DoAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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