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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889fe53fae1c173a47f630aefeec29164d61d25be3f1ec3048b05e895fa96ca4' 
  AND token = '6su7sG6o3iV4NCZgf2fzzM32A8D25vOgebLNNGam9sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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