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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12a081e272ce222ff58db6ab974d2170c1ed09094863212eb2435c656050689' 
  AND token = 'PBisnEYMphHfyq2RWHHUSvDrurpAuvqBgD1E2tieMeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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