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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16dfef662e757fc8e0c0191757650812c9a9e7b8b741243acca2a3ae808d42a' 
  AND token = 'dLVyaxQgQSM2gXng5o7ygqm0b2+Aef57PgVYCRAF/lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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