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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f927f550979570f47796f16da4f6fb9ed5b4e45b13ef3c6a04872976c6d29d8f' 
  AND token = 'cRxu2LfJVpHl0Z5e618E31c2YtbBMAHadBWOLm9U5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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