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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496178f5abc9d4d55d4847b53ba94536b37730afeee08b384e4f4037705268b0' 
  AND token = 'KGREQ+6006k3Bw9G3isXEK1lYsWzHD1f+lSacktu0wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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