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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e514fd866b309ebd8a8c94884516bb02d9bc62ca3d636aa8a5c60d94d88ff780' 
  AND token = 'SDL6qHCd+5OV0otllZ7Z84k0myvxfYcL+akODNKuPz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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