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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da1412bab38a42a00afb3fa490bbe682421d4fd6a0f71f240611d5e9923644f' 
  AND token = 'pU/8f2AKXFvY07JgAjYS7ZdNI3q5JdF7BIDMxKMKEZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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