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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a8aa4774dcae6d1a71fac3f1358f2a0c9059aa07778998d51b95f9664f1028' 
  AND token = 'nj+8mcjndenNFq/LOicNfVrOQxbsrrv88d53GfxngNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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