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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b77931b2162c4bd38baaff4e02c1f01a8dcee5b6af88f4d40657c513ea26a3f' 
  AND token = 'AGyabjFdi7TGf+ZSNJ/X0lZd3Qzq/wuR9jl8UlnAFAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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