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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bfc5a20a410c2e3a9d3749e6b7fa30c392af8e3b00d86b6915e06a3b9a3556' 
  AND token = 'aKAsA77BwvMfyY3/SQxC4aoNwZtv/esSmaey1QB+Vng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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