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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0dc62caaf19403ebffc290de9e3acdadb01c7628509c23d39531e212f6f7e7' 
  AND token = 'LMLK+Mlr2OrCPF4d+4PfNU1ptWnFSq3Mf3jT62s2iuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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