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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700bebbb5d72d02b2cd6f4934dfb0dc4d805171e29dd50835f0bc88c39b92cde' 
  AND token = 'fDqnnYEjAOjbXr54tRyWGMI+Ts6AHwQLP0bfLI4m2Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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