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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b77272fc0ad706bc4f929955cd06b2e881558142c8936922fcf724d3b377878' 
  AND token = '4AhTTeYQ9PKknnOLKJAU8To7epway6OI4zh3PbcWs+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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