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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699b3662154746d7fe572a0723ad310203ff1adc2220c37cd4ed736d48a77d1e' 
  AND token = 'LeDeD0+y+pyghe7ad5boIK2iUc8iFxT3Wet5r35PCHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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