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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33671f9f42c4e7f459e7829ba7f7594c958a01c16499a55b3ee62aefea74cf7d' 
  AND token = '6KXX+9XOw0ky8hTO3NEyk9E/XV6uKpuaA1CE2qLpql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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