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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b314e505e8aaac4a07e45fc63a1e1f0dd9946bd0d016e05290f6ad83ea841574' 
  AND token = 'zzpDQzt0TRGzhkjtKwaT8dTV03pBeDRkFbveDaAcjOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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