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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2969057da82450918ad6a59def5c333a3277fbdd8529d04c59dd661e9c3c6bc' 
  AND token = 'hDn8PyPCod1LnPhlP5l8aN7WziulsMG08U3s7Rr4k1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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