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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7939c069c4a5570f7bc7f9d86714d7f619594949932f9fb649ebefb9a1a8d94' 
  AND token = 'O03JyMi98znnfx+a1RGI0DrM/IemCHITISIIQyeozBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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