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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408700ced72baf8e91e8472049a8608ae293f13c0add3985c2a3ca2aacf0dc08' 
  AND token = 'K8ZPbDUM7DdD91njZVgf18Wuvch2Vpnb+VGOMF7r3kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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