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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a878adf7e35c2b5eb4777d2ab1d4f58650439d22f7a5e1e143d015aad47537' 
  AND token = 'Ld51xq8i863NsKpNIHVwiOpOIH6xhMv9EeNkDFX3q+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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