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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19c8b179d6c3cb8c6983b3f7255e6b18bdd01bd7486efba0689b49854284a4d' 
  AND token = '6114s2WntEmFPgkavZ7LYUplhLpDmxNgic5MMoV4VsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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