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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a04d08d81de665df553e8dea74555acd7e0f71ba6b9e27fbcf73573fe8fd950' 
  AND token = '/mDEOrHCBshcor/oStIP/bvD6ei03jmw8UD7cAE3z1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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