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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4628e704dd8954ba53f49d44f5a89affa2dbde55b6f8a2312947aeedecba2e8' 
  AND token = 's5bHQmoUubUL4BqlKBacKb1TzP+acXOFECj3CNnrq88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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