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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c700d115d54a47ae9930a2194708ed2261f582b2522aa1c5a6c29a3bd68c9eb8' 
  AND token = 'ULJkjtN9JiLEruZ7DPfnqO6DGiPLB5llWMojLAl75VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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