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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d3c2dc0ee0e60f3b5fb7b008d5bd3bf10483d4ed66b13c780fce212c9242aae' 
  AND token = 'rlU0AfNyj2WO8gOa7KboHTmyjxAOqTRmhe7v7qa43TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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