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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5fcec8a8e2d18d28ccb5138a5e6679f92f06190d3d86a29d399ad71dc2f236' 
  AND token = 'TMp8kWecwY+q4svRBac5BlXWthBN3VT3ou9BjftCBjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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