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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3442d501b96581b394c3f7d6d39a3d3d5523f5f313a97828e5aeeb256fc12bb' 
  AND token = 'fDrlqiuqFVo8RHbS9dnvfi5ogKVMmu8i4seCYNKgMRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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