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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2c9b45330cd0b7873f71a4044dd98d8bc3457de65027e9c7a8f5a19214d032' 
  AND token = '2nUUugIGre2nqI1sKpWadXj8X34Ck+CaFGs+SOMwfVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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